| Koshisaurus Temporal range: Early Cretaceous,
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| Fossil elements and model | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | †Ornithischia |
| Clade: | †Neornithischia |
| Clade: | †Ornithopoda |
| Superfamily: | †Hadrosauroidea |
| Genus: | †Koshisaurus Shibata and Azuma, 2015 |
| Type species | |
| †Koshisaurus katsuyama Shibata and Azuma, 2015
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Koshisaurus is a monospecific genus of basal hadrosauroid from the Kitadani Formation in Japan. The discovery of the genus suggests that hadrosauroids had higher diversity along the eastern margin of Asia in the Early Cretaceous.[1] "Koshi" means an old Japanese regional name including Fukui prefecture where fossils of the genus were discovered.